After renaming the files, also rename all the content
to follow the "Wi-Fi P2P" naming scheme.

This only adds the new device type and simple peer list handling.

Add missing trailing commas that avoids getting noise when another
file/parameter is added and eases reviewing changes[0].

[0] https://gitlab.gnome.org/GNOME/dconf/merge_requests/11#note_291585

Fixes: 7a59cd274485e4c0345c563d48e516967630d7f0

We need to copy all introspection files to the same directory when
building the documentation.

Note that we only require Meson 0.44, but for the documentation at
least 0.46 is needed because of a new functionality of
gnome.gdbus_codegen(). In this way we can still build on Travis CI
(without documentation).

nm-initrd-generator scans the command line for options relevant to network
configuration and creates configuration files for an early instance of
NetworkManager run from the initial ramdisk during early boot.

Remainder of typos found using `codespell -q 3 --skip="./shared,./src/systemd,*.po" -I ../NetworkManager-word-whitelist.txt` whereby whitelist consists of:
 ```
ans
busses
cace
cna
conexant
crasher
iff
liftime
creat
nd
sav
technik
uint
```

https://github.com/NetworkManager/NetworkManager/pull/205

For now, the device only exposes partial link status (not including
peers). It cannot create new links.

Check that we don't repeat the omission in future.